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The LUKJAN rb102105 is a straight end register boot designed to transition from a 5-inch diameter round duct to a rectangular outlet measuring 2.25 inches wide by 10 inches long. Fabricated from 26-gauge galvanized steel, it provides a rigid, corrosion-resistant connection point for end register installations in forced-air HVAC systems. The precision-formed construction minimizes air leakage at the boot-to-duct and boot-to-register interfaces, supporting efficient airflow delivery. This fitting is handled by HVAC sheet metal installers and mechanical contractors working in both new construction and replacement scenarios.
The rb102105 is suited for residential, commercial, and light industrial forced-air duct systems where a round supply trunk or branch line must terminate at a wall or floor end register. Its straight end orientation makes it appropriate for direct register face applications where the round duct approaches the register from directly behind rather than from the side. The 26-gauge galvanized steel construction holds up in standard ducted air delivery environments without special coatings or additional treatment.
Designed as an OEM-style replacement or new-installation fitting for forced-air HVAC systems requiring a straight end register boot with a 5-inch round inlet and a 2.25-inch by 10-inch rectangular outlet.
Installation is performed by licensed HVAC technicians or qualified sheet metal installers. Shut down the air handling unit and confirm the system is de-energized before cutting into or modifying ductwork. Secure the round duct connection with sheet metal screws and seal all joints with UL-listed duct mastic or foil-backed tape in accordance with local mechanical codes. Follow applicable SMACNA standards and local jurisdiction requirements for duct sealing and support.
We pulled together the parts most installs need for this unit, plus a few add-ons worth a look. Check what you need — nothing here blocks checkout.
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